【摘要】 对两级串塔脱硫系统的颗粒物协同脱除效果进行了数值模拟计算，建立了基于扩散、拦截及惯性撞击作用的液滴捕集模型，采用分段法、除雾器子模型和整体计算的方法，分析了预洗塔和吸收塔内的气液固三相流动，并对除雾器及整个脱硫塔的粉尘捕集效率进行了详细计算。结果表明：预洗塔和吸收塔本身能够有效地去除烟气中的粉尘颗粒，在除尘器出口粉尘浓度50 mg/m~3的情况下，脱硫塔出口粉尘浓度降到2.8 mg/m~3。吸收塔出口由于逃逸的石膏浆液导致的固体浓度为1.83 mg/m~3，经综合计算其可以达到超低排放的标准。可以看出，由于浆液液滴逃逸占固体颗粒物排放的比例为40%，需要选择高效除雾器降低浆液的逃逸量才能保证排放水平。研究为湿法脱硫系统的优化设计和运行提供了参考依据。更多还原

【Abstract】 This paper numerically simulated the collaborative removal of particulate matter of a 2-tandem FGD absorber system, established a droplet capture model based on diffusion, interception, and inertial impact effects, and used the methods of segmentation, ME sub-model, and whole absorber calculation, to analyze the gas-liquid-solid three-phase flow and capture efficiencies in the pre-absorber and absorber. The results showed that the pre-absorber and absorber could effectively remove dust from the flue gas. When the dust concentration at the outlet of the dust collector was 50 mg/m~3, the dust concentration at the absorber outlet could be reduced to 2.8 mg/m~3. The solid concentration at the outlet of the absorber caused by escaping gypsum was 1.83 mg/m~3; through comprehensive calculation, it was proved to meet the ultra-low emission standard. The liquid droplets had a great impact on the solid particle emission, and an efficient ME value was needed to ensure the emission level. This paper provides a reference for the optimization design and operation of wet desulfurization systems.更多还原